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Can the unittest Framework Discover Nested Tests?

Explore the limitations of the `unittest` framework when it comes to discovering nested test functions, and learn how to structure your tests for better discoverability. --- This video is based on the question https://stackoverflow.com/q/71050226/ asked by the user 'WestCoastProjects' ( https://stackoverflow.com/u/1056563/ ) and on the answer https://stackoverflow.com/a/71050422/ provided by the user 'Christoph Burschka' ( https://stackoverflow.com/u/2832011/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions. Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Can the unittest framework discover nested tests? Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l... The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license. If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com. --- Understanding Nested Tests in the unittest Framework When working in Python's unittest framework, you may find yourself needing to structure your tests in a way that allows for clear organization and readability. However, one question that often arises is: Can the unittest framework discover nested tests? This query is crucial if you want to maintain scope while ensuring that your tests are properly recognized. Let’s dive deep into understanding this issue and how to effectively structure your tests. The Problem: Nested Test Functions Consider the following example where you might want to create nested test functions: [[See Video to Reveal this Text or Code Snippet]] In this example, testJobSubmit and testJobShow are defined inside the testJobs method. Here’s the critical takeaway: functions defined inside another function (inner functions) only exist as variables within the local scope of the outer function. This means they can’t be accessed or recognized by the unittest discovery mechanism. The Error Encountered When attempting to run this structure with the unittest framework, you might encounter an error stating: [[See Video to Reveal this Text or Code Snippet]] This error arises because the unittest framework does not identify the nested test functions. Thus, they do not get executed as part of the test suite. The Solution: Restructuring Your Tests To ensure that your tests are successfully discovered and executed by the unittest framework, you need to elevate each test method to the class level. Here’s how you can restructure your tests: Revised Sample Structure [[See Video to Reveal this Text or Code Snippet]] Explanation of Changes Elevated Test Methods: testJobSubmit and testJobShow have been moved to the class level, making them accessible to the unittest discovery process. Method Calls: If you need to use results from one test within another, consider calling the first test method directly from another, as shown in testJobShow. Conclusion In summary, nested test functions will not be discovered by the unittest framework due to their local scope limitation. To create maintainable and properly discoverable tests, always define your test methods at the class level. This approach not only organizes your tests better but also ensures that they are recognized and executed as intended within your testing framework. By structuring your tests effectively, you can leverage the powerful features of the unittest framework without running into scope-related issues. Happy testing!